We have been having 2 channels on the board that have a yellow box around intensity on start up and only come up to 40% unless we hit RemDim after start up. It didn't happen before and is starting to happen all the time now. Any idea whats going on and how we can fix this ?

Sounds like you have a inhibitive sub that is affecting those. I would go thru the Groups display, filter to only look at Submasters (the button at the top) and then go thru and see what other subs may be controlling those channels.